no
Because there is no central government in Wicca there is no "Grand High Witch" in individual groups such as a coven there are High Priestesses and High Priests.
A gathering of witches is usually called a coven.
The leader of a coven is a witch. Male of female, they are a witch first. In some groups they are called a High Priest and/or High Priestess. Generally speaking all practitioners are Priests/Priestesses as they all have the right and ability to speak directly to their deities, If you encounter a Witch Queen, you are talking to a woman who has created and lead three or more covens (circles or groups).
Visit a coven.
warlock The Leader of a coven is not a warlock. Leardership is most often split between a High Priestess and a High Priest
The leader of a coven is typically referred to as a high priestess or high priest, depending on their gender. They are responsible for guiding the group's activities, rituals, and spiritual practices.
The high witch
A solitary Witch is a Witch who privately practices the Craft most often in solitude. They may or may not associate with a Coven or Coven members. They are generally not an accepted member of any Coven. You could compare this to a Christian who prefers to worship Christ in the privacy of his/her home; and who is not an affiliated member of a Church. There are many reasons for this type of practice; sometimes personal.
There really isn't a head witch. we believe that everyone is equal. People like author Silver Ravenwolf, Scott Cunningham or Amber K, might be "higher up" on the witch scale but they live in a normal houses with normal lives. Subject for further research include: Wicca, Paganism, The Craft, Witchcraft, Pentacles.
Usually, yes - especially if the coven has more than two people. The leaders are usually the most experienced in the Wiccan coven. Depending on their gender, they are called the High Priest or the High Priestess.
The plural form of the noun witch is witches.example: A coven of witches brewed up some trouble in their cauldron.